In semi-conductor devices, silicon atoms are considered to be 0.25 nanometres in diameter. I cant imagine the orbitals of a much smaller atom to be bigger.
This scale would have to be a size projected onto a detector. The scale of the source would then be determined by the details of the experiment.
This scale would have to be a size projected onto a detector. The scale of the source would then be determined by the details of the experiment.